3 ms·
This is very true. Good terminations and good materials matter. By far the best coax is silver semi-rigid -- brilliant for the bottom of my lHe cryostats, not e
by azalemeth 3y ago
This is very true. Good terminations and good materials matter. By far the best coax is silver semi-rigid -- brilliant for the bottom of my lHe cryostats, not exactly a cable in any other terms.
One thing this article didn't mention is hope the length really matters if that meter isn't perfectly impedance matching. Stub and strip lines and all that.
- anonymousiam 3y agoYou've touched on what is probably the real issue, but without further measurements, we cannot know for sure. The author said (in the comments) that they used an antenna as the load. With a minimum SWR of 2:1, it's obviously not a very good match. If the match is bad, the length of the cable could have a big effect on the measured power. Other comments suggested using a resistive dummy load instead of an antenna. THAT is the way to go if you are measuring cable insertion loss. The two cables with the poor insertion loss were 3 and 10 meters in length. None of the good cables were of these lengths.